Telegram Groups (requires Telegram app to sign up. It uses your mobile number to do SMS verification (no spammer robots, please). Afterwards you can put in whatever username you want. Your number isn't shared with anyone. It also has a web browser version.)

A HucowDiscord chatroom is available. Here's the description from the owner:

Whether you're a cow that wants to talk about your kink/desires or an Owner/Farmer/Trainer/Bull that wants to find a cow, The Hidden Farm is gonna become that place ;)
From day one we'll have personal ad areas for both cows and owners/farmers/trainers/bulls, a 'training' room, a roleplay area, channels for breast expansion, lactation, ANR/ABR, Breeding, to Selfies/hucow media rooms, Custom user colors and self-assignable roles.
Come call The Hidden Farm your new home ;)

ANRelationships - A Site for Adult Nursing and Adult Breast feeding relationships (New!)

Fetopia: The European BDSM, fetish & kink community (requires account creation to view page) - similar to Fetlife; it has a couple of groups dedicated to lactation and breastfeeding (search for milk, breast play, suckling, breastfeed, hucow, ANR, or ABF).

Depending on which site you're on, you might be able to use our memes (warning:NSFW) or make your own. Additionally, the site logo is free to use to upload to your profile; pin button and flyer templates are now available.